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authorFrancis Rowe <info@gluglug.org.uk>2014-11-06 01:52:36 +0000
committerFrancis Rowe <info@gluglug.org.uk>2014-11-06 01:52:36 +0000
commit8b2219bfa2da36e7809588ef723a10483a6e137f (patch)
tree8c4d74b9efbdabc1a2604b8cbd508c006c225241 /docs/misc/index.html
parent7429bdcdbb4fc51c61897115112468642afeecfc (diff)
Documentation: *major* cleanup.
Cleanup was long overdue. Old structure was messy and inefficient.
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+<!DOCTYPE html>
+<html>
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1">
+
+ <style type="text/css">
+ @import url('../css/main.css');
+ </style>
+
+ <title>Miscellaneous</title>
+</head>
+
+<body>
+
+ <h1 id="pagetop">Miscellaneous</h1>
+ <p>
+ Or <a href="../index.html">Back to main index</a>.
+ </p>
+ <ul>
+ <li><a href="#high_pitch_trisquel">High Pitched Whining Noise on Idle (how to remove in Trisquel)</a>
+ <ul>
+ <li><a href="#howtouse_powertop">Powertop - how to use</a></li>
+ <li><a href="#powertop_autostart">Powertop - Start automatically at boot time</a></li>
+ </ul>
+ </li>
+ <li><a href="#high_pitch_parabola">High Pitched Whining Noise on Idle (how to remove in Parabola)</a></li>
+ <li><a href="#serial">X60/T60: Serial port - how to use (for dock owners)</a></li>
+ <li><a href="patch.html">Using diff and patch</a></li>
+ <li><a href="#get_edid_panelname">Get EDID: Find out the name (model) of your LCD panel</a></li>
+ </ul>
+
+<hr/>
+
+ <h1 id="high_pitch_trisquel">High Pitched Whining Noise on Idle (how to remove in Trisquel)</h1>
+
+ <p>
+ Tested in Trisquel 6.
+ </p>
+ <p>
+ Note: untested in Trisquel 7. Remove this note when it is.
+ </p>
+
+ <h2 id="howtouse_powertop">Powertop - how to use</h2>
+
+ <p>Now you can use this command to kill that noise:<br/>
+ <b>$ sudo powertop --auto-tune</b></p>
+
+ <p>You can also run it without parameters and then go into 'Tunables' and set everything to 'Good'</p>
+
+ <p>Note: On Trisquel 6, you will need to use a later powertop version from git. The one in the repositories is too old. See below:</p>
+
+ <h2 id="powertop_autostart">Powertop - Start automatically at boot time (Trisquel 6)</h2>
+
+ <p>Included with libreboot is a script called 'powertop.trisquel6'. Run this and it will setup powertop to run with --auto-tune
+ at boot time. Load the file in your text editor to see how it does that.</p>
+
+ <p><b>$ ./powertop.trisquel6</b></p>
+
+ <p>This has been tested on Trisquel 6.</p>
+
+ <p><a href="#pagetop">Back to top of page</a></p>
+
+<hr/>
+
+ <h1 id="high_pitch_parabola">High Pitched Whining Noise on Idle (how to remove in Parabola)</h1>
+
+ <p>The following removes most of the noise. It reduces what is a high frequency whine
+ (that not everyone can hear) to a slight buzz (which most people can't hear or doesn't bother most people).</p>
+
+ <p>This is not perfect! The full solution is still not discovered but this is a step towards that.
+ Also, in some instances you will need to run 'sudo powertop --auto-tune' again.
+ This needs to be implemented properly in coreboot itself!</p>
+
+ <p>On the X60 with coreboot or libreboot, there is a high pitched sound when idle.
+ So far we have use processor.max_cstate=2 or idle=halt in GRUB.
+ These consume power. Stop using them! </p>
+
+ <p>Be root<br/>
+ <b>$ su -</b></p>
+
+ <p>Installed powertop:<br/>
+ <b># pacman -S powertop</b></p>
+
+ <p>and added the following to /etc/systemd/system/powertop.service :</p>
+
+<pre><i>
+[Unit]
+Description=Powertop tunings
+
+[Service]
+Type=oneshot
+RemainAfterExit=no
+ExecStart=/usr/bin/powertop --auto-tune
+# "powertop --auto-tune" still needs a terminal for some reason. Possibly a bug?
+Environment="TERM=xterm"
+
+[Install]
+WantedBy=multi-user.target
+</i></pre>
+
+
+ <p>Finally, as root do that:<br/>
+ <b># systemctl enable powertop</b><br/>
+ <b># systemctl start powertop</b></p>
+
+ <p>The next time you boot the machine, the buzz will be gone.</p>
+
+ <p><a href="#pagetop">Back to top of page</a></p>
+
+<hr/>
+
+ <h1 id="serial">X60/T60: Serial port - how to use (for dock owners)</h1>
+ <p>
+ For the Thinkpad X60 you can use the <b>&quot;UltraBase X6&quot;</b> dock (for the X60 Tablet it is called
+ X6 Tablet UltraBase). For the ThinkPad T60,
+ you can use the <b>&quot;Advanced Mini Dock&quot;</b>.
+ </p>
+ <p>
+ If you are using one of the ROM's with 'serial' in the name, then you have serial port enabled in libreboot
+ and you have memtest86+ included inside the ROM. Connect your null modem cable to the serial port on the dock
+ and connect the other end to a 2nd machine using your USB Serial adapter.
+ </p>
+ <p>
+ On the 2nd machine, you can try this (using GNU Screen):<br/>
+ <b>$ sudo screen /dev/ttyUSB0 115200</b>
+ </p>
+ <p>
+ How to quit GNU Screen: Ctrl+A then release and press K, and then press Y.
+ </p>
+ <p>There are also others like Minicom but I like GNU Screen</p>
+ <p>
+ By doing this before booting the X60/T60, you will see console output from libreboot. You will also see
+ GRUB displaying on the serial output, and you will be able to see MemTest86+ on the serial output aswell.
+ You can also configure your distro so that a terminal (TTY) is accessible from the serial console.
+ </p>
+ <p>
+ The following guide is for Ubuntu, and can be followed for Trisquel 6.0 which is based on Ubuntu 12.04
+ (should also work in Trisquel 7, based on Ubuntu 14.04) to enable a serial console using GeTTY:<br/>
+ <a href="https://help.ubuntu.com/community/SerialConsoleHowto">https://help.ubuntu.com/community/SerialConsoleHowto</a>
+ </p>
+ <p>
+ Note: part of the tutorial above requires changing your grub.cfg. Just change the <b>linux</b> line to add instructions for enabling getty.
+ See <a href="../gnulinux/grub_cbfs.html">../gnulinux/grub_cbfs.html</a>.
+ </p>
+ <p><a href="#pagetop">Back to top of page</a>
+
+<hr/>
+
+ <h1 id="get_edid_panelname">Get EDID: Find out the name (model) of your LCD panel</h1>
+ <p>
+ Get the panel name with <b>sudo get-edid | strings</b><br/>
+ Or look in <b>/sys/class/drm/card0-LVDS-1/edid</b>
+ </p>
+ <p>
+ Alternatively you can use i2cdump. In Trisquel, this is in the package i2c-tools.<br/>
+ $ <b>sudo modprobe i2c-dev</b><br/>
+ $ <b>sudo i2cdump -y 5 0x50</b><br/>
+ $ <b>sudo rmmod i2c-dev</b><br/>
+ You'll see the panel name in the output (from the EDID dump).
+ </p>
+ <p>
+ If neither of these options work (or they are unavailable), physically removing the LCD panel is an option.
+ Usually, there will be information printed on the back.
+ </p>
+
+ <p><a href="#pagetop">Back to top of page.</a></p>
+
+<hr/>
+
+ <p>
+ Copyright &copy; 2014 Francis Rowe &lt;info@gluglug.org.uk&gt;<br/>
+ This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions.
+ A copy of the license can be found at <a href="../license.txt">../license.txt</a>.
+ </p>
+
+ <p>
+ This document is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See <a href="../license.txt">../license.txt</a> for more information.
+ </p>
+
+</body>
+</html>